7 1/4 to 8 3/4 rear end swap info needed
Did it 20 or more years ago to my Dart, now everything is up to 340 specs except the original 318.
Yep, shock plates and the correct sized U bolts and shorten or replace the drive shaft and you should be home free.
Then you can start playing with easy to swap gears and things. I started out with a 3.91 open rear outa a 71 Dart and later upgraded to a early 742 power lock sure grip with 3.23 gears. I did have to shorten my drive shaft seeing how it has the big 7290 u joint with a adapta joint so it works with my A body rear end. I THINK the shock plates/u bolts from a 8 1/4 will work as well seeing how early A body rears are getting way harder to find and spendy these days.